Field-coil support.



No. 890,539. PATENTED JUNE 9, 1908. E. W. STULL. FIELD COIL SUPPORT.

APPLICATION FILED MAR. 9, 1905.

Inventor:

i'mmef W Smil- Horn ey- UNITED STATES PATENT OFFICE.

EMMETT W. STULL', OF N ORWOOD, OHIO, AS-SIGNOR'TO THE BULLOCK ELECTRIC MANUFAC- TU RING COMPANY, A CORPORATION OF OHIO.

- I FIELD-COIL SUPPORT.

Specification of Letters Patent.

- Patented June 9, 1908.

which the following is a full, clear, and exact specification. I

My inventlon'relates to improvements 1n dynamo electric machine construction and particularl to the means employed'for holdmg thev fie d coils of the machine firmly in place on the poles thereof. i

In dynamo electric machines and especiallyin portable motors, it often happens that the machine is subject to vibration which has a detrimental effect upon the machine if the parts are not all firmll held in-place. This is especially true wit1 railway motors which are subject to severe vibration and great changes in tem erature and climatic conditions. It there ore happens that under certain circumstances the field .coils'which fit closely upon the pole-pieces when the machine is first assembled become loose and move on the polenews, the msu-\ lation of the coils is abrade and punctured and the coils become grounded or short ,cirouited.

The object of myinvention is to avoid-the difficulties above enumerated and to accomplish this object I employ a spring plate coil seat which holds the the' ole-piece.

ore specifically considered In invention consists .of a dynamo electric mac 'ne frame,

a field coil mounted in said frame, and a coil support consisting of a plate of spring metal having tabs punched therefrom and bent .out

40 of the plane of the plate, said plate being located between the coil and the frame.

-In the accompanying drawings, which 'illustrate the preferred embodiment of my invention,Figure 1 is an elevation, partly in section, of the field frame of a railway motor eqe pped with my improved field coil support; .Fig. 2 is a sectional view,of part oft e machin'e shown in Fig. '1 on a larger scale; .Fi s.. 3 and 4 are planand end views of the 9- coil support removed from the pole; and

- Fig. 5 1s a sectional, view on lin,e-55 of Fi 3. v Iteferring now to the drawings,-the frame of the dynamo electric machine is illustrated as the fieldframeA; of a railway motor.. The

another direction.

coil firmly in place onpole-pieces B are fastened to said frame in any suitable manner, such as by means of bolts C. The field coils D which surround said pole-pieces are held firmly in place thereon by means of the spring plate F which is preferably located between the .frame and the coil. This plate F is prefer ably of spring steel or other resilie t material. The plate has a central openifig through which the pole-piece is passed and also has slits f which permit portions of the metal of the plate to be bent out of the plane of the plate to form leaf springs or tabs f. These tabs are punched from the plate F all around the central opening in the manner shown in- Figs. 3 to 5 inclusive, and the slits f are preferably so arranged that some of the tabs may be bent in one direction and others in Thebest results are obtained when adjacent tabs are bent in oppopipe directions; that is, alternately right and When the plate is in position on the polepiece, the tabs prefera ly rest against the frame, (though if desired this position may be reversed) and maintain the face of the plate in substantially the same plane. The tabs act as leaf springs which hold the coil firmly in position onthe pole, forcing said coil with considerable pressure against the late E which rests against the pole tips I).

shape of the coil due to the detrimental efiects of term erature changes and climatic conditions. any shrinkage of t e coi due to the drying. out of the insulation.

To avoid damage to the coil insulation by the punched late F, I prefer to employ an imperforate ate G between the plate F and the coil. T 's plate G may be of metal or insulating material as desired.

I- aim in the appended claims to cover all modifications of my invention which do not involve a departure from its spirit and sco e.

Having thus described my invention, w at I claim as new and desire to secure by Letters Patent is i 4 1. In a dynamoelectric machine, a frame, a pole piece therein, a coil mounted on said po e-plece, and a plate/of spring metal having tabs punched therefrom and bent out of the plane of the plate alternately in opposite directions, said plate and tabs coo crating with the coil and frame to form a yie ding support forthecoil.

2. In a dynamo electric machine, a frame,

a field coil mounted in said frame, and a coil support consisting of a late of spring metal having tabs punche .therefrom and 'bent out of the plane of the plate, said plate being located between the 001 and frame, and

an im erforate plate located between the coil and t e coil support.

3. In a dynamo electnc machine,- a frame carrying a pole-piece, a coil surrounding said ole-piece, and a coil support also surroundmg said ole-piece and located between the 1 c011 and rame, said support consisting of a 4.-A coil support consisting of a plate of,

spring metal havinga central opening to receive a pole'piece,-said plate having tabs punched therefrom, said tabs being bent out I of the plane of said plate alternately in opposite directions.

In testimony whereof I aflix my signature, in the presence of two witnesses.

' EMMETT W. STULL.

Witnesses; p

LAURENT LOWENBERG,

FRED J. Kmsnr'. 

